james



F. COXON.

RADIAL ARM DRlLLING MACHINE.

APPLICATION FILED OCT. H. l9l'1.

Patented" Nov. 1919.

INVENTOR fi'ed Comm Afro/mam ti o spares rs rnn r enrich.

FRED COXON, or BIRMINGHAM, ENGLAND, nssienonuiomiuns AnoirnALn a com-ra ny,

L M D. B Y HGHM -NB A 'D- RADIAL-ARM nnrpprrtouvmonmn. 7

Specification of Letters Patent. Patented N 25, 1919,

Application filed October '17, 1917. Serial No. 197,093.

'0 all whom it may concern Be it known that I, FRED Coxox, a subject of the'King of Great Britain and Ireland, residing at lvlanchester .Vorks, Led- 5 sum street, in the city of Birmingham, England, have invented certain newand useful improvements Relating to EadialArm Drillingtlacnines, of which the following is a specification.

This invention relates to radial arm drilling machines and has for its object to provide improved means for actuating the arm locking mechanism and also the clutch of the mechanism whereby the arm is raised or lowered.

The invention comprises the employment of a hand operated shaft connected to both the locking mechanism and the clutch, the mangcment being such that longitudinal 2o movement of the shaft actuatcs the clutch and a rotational movement the locking mechanism.

In the accompanying drawing Figure 1 illustrates diagrammatically a device con structcd in accordance with this invention, and Fig. is a sectional view of one shaft showing the cam thereon.

in applying the invention as shown to a machine in which the radial arm slides upon a vertical cylindrical pillar, the sleeve (1. which embraces the pillar is divided as heretofore at twopositions 7) so that it can he entrusted on the pillar. For effecting this movement a known cam device a is provided at each division, each cam being mounted 011 its own shaft (Z. lhe two shafts are in alincment and the adjacent cnds are connected by an epic'yclic mechanism. Such mechanism comprises sun pinions a secured to the shafts, and planet pinions on a spindle which is carried by arms g. The pinions i are of slightly different diameters as are also the pinions f. The pinions j are secured together or formed integrally in the same piece of metal. Each of the arms 9 is free on its shaft and is formed as a toothed sector at one end and is actuated from a double pinion it through which can slide a shaft 2' which is featherkeyed to the pinion. At one end the shaft is connected to a lever j which actuates a clutch Z in conjunction with the automatic raising and lowerin mechanism of the arm. On the other end a hand lever 70 1s provlded 5 5 for actuating the shaft. In conjunction with the lever or any other convenient part of the shaft or of the mechanisms associated with it, suitable provision is made for preventing actuation of the shaft before the arm is unlocked, or locking of the arm before the clutch is put out of action. Rotation of the shaft operates the locking mechanism without afiecting the clutch, and endwise movement of the shaft operates the clutch without affecting the locking mecha nism.

The invention is not limited to machines of the cylindrical pillar type, nor to clamping mechanism comprising epicylic wheels, and the details may be varied to meet different requirements.

Having thus described my invention What I claim as new and ters Patent is I 1. In radial arm drilling machines, means for actuating the arm locking mechanism and also the clutch of the mechanism whereby the arm is raised or lowered, said means consisting in part of a hand operated shaft which can both slide and rotate, the sliding movement being utilized to actuate one looking mechanism and the rotational movement the other, substantially as described.

' 2. In means for actuating the arm looking mechanism of a radial arm drilling machine and also the clutch of the mecha-' nism whereby the arm is raised or lowered, the combination comprising a slidable and rotatable hand operated shaft, a pair of shafts in alinement and parallel with the first shaft, a sector arm on each of the second shafts, planet pinions carried between desire to secure by Letthe arms, a sun pinion on each of thesecond shafts gearing with a planet pinion, a pinion on the first shaft gearing with the sector arms, means for communicating the rota tional movement of the second shafts derived from the first shaft to the arm looking mechanism, and means for communicating the sliding movement of the first shaft to the clutch mechanism, substantially as described.

3. In radial arm drilling machines, the combination comprising a pillar, a sleeve movable on the pillar, and divided at two positions, cam locking mechanism at each division, a pair of rotatable cam actuating shafts mounted in alinement, a hand operated shaft parallel to the. cam actuating shafts said hand operated shaft being slidable and rotatable, a sector arm on each cam shaft, planet pinions carried between the said arms, a sun pinion on each cam shaft, a pinion on the hand operated shaft gearing with the sector arms, means for rotating and sliding the hand operated shaft and for transmitting the sliding movement to a ,ise

Clutch for starting or stopping an arm raising and lowering mechanism, substantially as described.

In testimony whereof I have signed my name to this specification.

FRED COXON. 

